package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.ss.formula.functions.Now;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Aspect
@Component
public class AutoFillAspect {

    /**
     * 切入点表达式
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) " +
            "&& @annotation(com.sky.annotation.AutoFill)")
    private void autoFillPointcut() {}

    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("公共字段自动填充..");
        //获取被拦截方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取AutoFill注解
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取被拦截方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }

        Object entity = args[0];
        //获取修改参数
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //插入方法为4个参数进行赋值
        if (operationType.equals(OperationType.INSERT)) {
            try {
                //通过反射获取方法
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //调用方法
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType.equals(OperationType.UPDATE)) {
            try {//更新操作为2个参数赋值
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
